Backpack vacuum cleaner



FIG. 1 is a perspective view of a backpack vacuum cleaner showing my newdesign;

FIG. 2 is a right side elevation view thereof, the left side being amirror image of the right side view;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The environmental structure shown in broken lines and the dash dot lineswhich illustrate boundary lines form no part of the claimed design.

CLAIM The ornamental design for backpack vacuum cleaner, as shown anddescribed.